>I need help with a sql string. My table has a serial number column which is unique. The second column has a part number which can be duplicatied but not in all cases. The third column is an airplane tail number which is the same for all records in set. I need the top two serial numbers(if only 1 exists then top 1) for every distinct part number filtered by the tail number.
>
>Example:
>S/n P/n T/n
>1 845-1 XYZ
>2 846-1 XYZ
>3 846-1 XYZ
>4 846-1 XYZ
>5 847-1 XYZ

Are you using SQL Server or what is your database? If it's a SQL Server, then several simple solutions are available in SQL 2005 and up using ROW_NUMBER() function or CROSS APPLY.